We need to select most appropriate answer. Here in this case there will be loss of 0.16% but it is not in options but None of these is given in options so NONE OF THESE will be most appropriate answer . so correct answer is None of these
When two articles are sold at same price and on one article profit of r% and on another loss is r % then in such case there will be always loss of r^2/100 % so here loss will be of (4*4)/100 = 0.16 % loss so answer is None of these.
4-4-4*4/100=.016